Drinks are alcoholic if they're made in a certain way.
Alcohol is often made from grains, like barley, or fruits, like grapes. But after it's gone through a process called fermentation, it becomes very strong and can change your mood when you drink it.
There are lots of different kinds of alcohol. Some of the main ones are beer, wine, cider; or spirits like vodka and whiskey.
Alcohol can be addictive. Alcoholics are people who are addicted to alcohol.